Experiment of heat transfer coefficients of film cooling over a rotating blade

Measurements of heat transfer coefficient (h_g) were presented for single film hole with a diameter of D = 4 mm in 30° inclined injection on a rotating flat form blade. Tests were conducted at the rotating speed (ω) of 0 r/min and 800 r/min, respectively. The mainstream Reynolds number based on the film hole diameter (Re_D) was 3191. The blowing ratio (M) was controlled to be from 0.4 to 2.0 while the density ratio (DR) of 1.02 was obtained with air injection. Thermochromic liquid crystal (TLC) was used to obtain the temperature distributions on the blade surface. The results show that an obvious deflexion in the spanwise direction is occurred under rotating case and the deflexion angle on the suction surface is greater than that on the pressure surface; the blowing ratio performs great influence on the heat transfer coefficient, and the influences are different between the stationary and rotating cases.